I've Had A Sore Throat For 5 Days And It

I've had a sore throat for 5 days and it keeps getting worse not matter what I do. It started on Saturday after I was singing for 3 hours, so I thought that was the cause. On Sunday, I had a really bad cold and a mild fever. I stayed home from school on Monday and the cold went away, but the sore throat was killing me. It got to the point where I couldn't swallow anything except liquids. Tuesday, I stayed home from school again, and the sore throat didn't go away. I was having tea with lemon and honey to sooth it before, but that just irritated it at this point. I looked at my throat with a flashlight and saw a white spot on my uvula. I went to the doctor and they tested me for strep throat, but it came back negative. Today, I stayed home again. Nothing is soothing the pain. I've been taking lozenges all day, but they stopped working. Ice cream doesn't help anymore and neither does chicken soup. At this point, the only things I can swallow are water and applesauce, and the white spot on my uvula is still there and it's gotten bigger. What do you think this is, and what do you recommend I do to sooth the pain and hopefully stop it all together?